I'm would like to say hi to everyone on board here. I've enjoyed reading the post's and I must say from the helpful and friendly advice I've seen here. You guy's and gal's have had a big influnence on my moving up to a ford...However I do have a question> I have a 04 Lariet I bought Dec.26 and it is the nicest vehical I have ever owned in my 49 years. Every time I climb into it I can't help but to say to myself "I'm not worthy" But any way I hope we will be soulmates for a long time. On cold mornings at start up and I put it into gear there is a vibrating buzzing noise coming from under the hood on the drivers side when I put it into gear. It's too early in the AM to get someone to hold the brake while I pop the hood. Sometimes on warmer mornings I hear the same sound as I accerlerate for only a brief small window at take off. Any ideas What it could be???? I can live with a little personality but I want to keep her perfect. Thanks for any advice

 

My first thought is electric fuel pump? Even though you say under the hood.

 

My guess would be a heat shield on the Y pipe.
My F-250 had the same noise and a stainless hose clamp did the trick.

 

Thanks. I'll check it out